Graphene Oxide Templated Growth and Superior Lithium Storage Performance of Novel Hierarchical Co2V2O7 Nanosheets

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• 作者：Yanzhu Luo ; Xu Xu ; Yuxiang Zhang ; Chih-Yen Chen ; Liang Zhou ; Mengyu Yan ; Qiulong Wei ; Xiaocong Tian ; Liqiang Mai
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：February 3, 2016
• 年：2016
• 卷：8
• 期：4
• 页码：2812-2818
• 全文大小：508K
• ISSN：1944-8252

文摘

Hierarchical Co₂V₂O₇ nanosheets consisted of interconnected nanoparticles are synthesized by a facile method using graphene oxide as the template. The electrochemical reaction mechanism of the Co₂V₂O₇ nanosheets is thoroughly investigated by in situ XRD and ex situ TEM. The initial Co₂V₂O₇ transforms into CoO nanoparticles and vanadium oxides in the first cycle, and the following reversible conversion reaction mainly occurs between CoO and Co and lithiation/delithiation of the vanadium oxides. The Co₂V₂O₇ nanosheet displays a high reversible capacity (962 mAh/g at 0.5 A/g) and remarkable high rate capability. When cycled at 5.0 A/g, a reversible capacity of 441 mAh/g can be retained after 900 cycles. The stable high capacity and excellent rate capability make the hierarchical Co₂V₂O₇ nanosheets a promising anode material for lithium-ion batteries.